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为研究淹水时KNO3对甜樱桃根呼吸的影响,设四组盆栽甜樱桃,其中一组淹入清水,其余三组分别淹入不同浓度的KNO3溶液,保持液面高出盆土表面,每天定时测定甜樱桃根有氧呼吸速率,结果如图。请回答
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must, our, keep, clean and tidy, we, classroom ________________________________.
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若(x+y)除以z=(y+z)除以x=(x+z)除以y=k,求k
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